Abstract: In order to solve the problems that the devices of filling powder into cavity have a low efficiency and a slow filling speed, and the outlet is easily blocked, the patents of devices of filling powder into cavity in our patent database have been searched and analyzed. Firstly, the existing devices have been analyzed using causality analysis method. Then, the algorithm of the method of the small people is used to obtain the theoretical model to solve the problem. After that, the technical contradictions of the original model have been analyzed by 40 invention principles and 39 general engineering parameters of TRIZ theory. Finally, an innovative device of filling powder into cavity has been designed. The design can improve the filling speed and reliability of powder filler.